AddressBase Islands

AddressBase® Islands delivers the detail for Northern Ireland, Isle of Man and the Channel Islands which you find in AddressBase Plus and AddressBase Premium.


For major businesses offering household services nationwide, taking AddressBase Islands means you have consistent property information for Northern Ireland, the Channel Islands and the Isle of Man on tap from a single source.

In the busy call centre environment, your staff will always get results no matter where the address is located. And because our data’s regularly updated, your records will be more reliable, too.

Boost your marketing ROI. AddressBase Islands means you can run successful truly national campaigns – or build awareness in new markets, targeting households in properties converted into flats, for example.

Addressing beyond Great Britain

For the first time, AddressBase customers can access over 1 million extra records complete with the UPRN, outside of Great Britain.

Feature 1

Straightforward licensing

We offer the same style of licence for AddressBase Islands as existing AddressBase products. This ensures you can use your AddressBase Islands data in a consistent way across the United Kingdom and Crown Dependencies.

Feature 1

Available in two versions

AddressBase Islands is available in two versions, allowing you to attach it to your existing GB AddressBase product, whether that’s AddressBase Plus or AddressBase Premium.

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Simplified data management

Since AddressBase Islands brings together multiple data sources and is released alongside GB AddressBase products, your back office team saves time by managing just one dataset each time instead of four.

Feature 1

Try AddressBase Islands

Get a three-month free trial of AddressBase Islands data by signing up to our Data exploration licence.


Key featuresWhat this product offers

Comma Separated Value (CSV) and GML 3.2.1

Data structure



Address elements and coordinates for each address


1:1250 to 1:10 000

Update frequency

Six-weekly refresh (view release schedule)




Northern Ireland, Channel Islands and Isle of Man

AddressBase Islands support ›


How is this data supplied and what do I need to use it?

AddressBase Islands is supplied via download.

You'll need geographic information system (GIS) software to use it.

How often is it updated?

Updates for both AddressBase Plus Islands and AddressBase Premium Islands are released every six weeks (known as an Epoch).

Please see in our release notes for the specific date on which the data in a given Epoch was cut.

What are the differences between the two AddressBase Islands products?

There are two AddressBase Islands products: AddressBase Plus Islands and AddressBase Premium Islands.

AddressBase Plus Islands contains current properties including addresses sourced from Local Authorities, Ordnance Survey and Royal Mail, all provided with an UPRN (Unique Property Reference Number), for Northern Ireland, Channel Islands and the Isle of Man.The product enables the end-user to locate an address or property on a map using either X, Y coordinates supplied on a British National Grid or Latitude and Longitude coordinates provided on an ETRS89 projection.

AddressBase Premium Islands provides the most detailed view of an address and its lifecycle for Northern Ireland, Channel Islands and the Isle of Man. It has more records than AddressBase Plus Islands as it provides all the information relating to an address or property from creation to retirement.The product contains Local Authority, Ordnance Survey and Royal Mail addresses. This includes provisional addresses (proposed planning developments), and historic information (demolished properties) where available.

Ordnance Survey addresses are added to the AddressBase Premium Islands product where necessary to ensure the schema meets the core AddressBase products.

Do the Islands products contain Royal Mail's Postcode Address File?

Yes, this is a vital component of both Islands products. Royal Mail information will therefore be present where a match can be made between the Local Authority address and an address from Royal Mail.

Will commercial customers have to pay Royal Mail royalties separately?

Royal Mail royalties are included into the licence fee if you are already a Great Britain AddressBase product customer.

Additional Royal Mail royalties will apply if you aren't an existing Great Britain customer.

Are AddressBase Islands products part of the Public Sector Mapping Agreement?

No, but you're welcome to license AddressBase Islands products under a commercial agreement with us or one of our Partners. Get OS data.

See all FAQs for AddressBase Islands ›


AddressBase Islands is available under the following Licences:

Explore our data

You’re welcome to try out this data for free under our Data Exploration Licence.

Internal business use

When using OS data in your own business, you need our Framework Contract (Direct Customers) together with a data contract.

Creating products or services

To use this data commercially in your own products and services, or to distribute it, you will need to sign up to our Framework Contract (Partners) and a relevant defined use contract. This will vary depending on what you’re going to do with the data.

Collective mapping agreements

These products are available to members of public sector organisations under the following agreements:

Find out more in our Public sector licensing guide ›

This product is available under the:

  • Media Licence. We encourage the use of OS maps in the media – TV, films, print and online. Sign up free to give your consumers valuable context via an authoritative map.
  • Publishing licence. This is suitable for one-off publishing of maps in publications, on merchandising and websites.
View all licences ›

Case studies